If a municipality commits land for inclusion in a recreation river corridor described in AS 41.23.500 , the commissioner shall obtain the concurrence of the municipality to the management plan proposed under AS 41.23.440 as it applies to municipal land. The commissioner shall cooperate, at the request of a municipality, in planning for municipal land adjacent to a recreation river corridor. Municipal land not committed by a municipality for inclusion in a recreation river corridor is excluded from the operation of the management plan.